Pokemon Blue is one of the first Pokémon games, published for Game Boy back in 90s, along with POKEMON: RED VERSION. You have to explore the mystical land of Kanto in search for Pokémon, battle them and become the champion of the Pokémon League. You also have to unlock all 150 Pokémon, available in the game. Have fun!
Game Boy Buttons are:
DIRECTIONAL PAD = ARROW KEYS | A = Z. B = X. | START = ENTER. SELECT = SPACE